[patch] enhance powerd(8) to handle max temperature
M. Warner Losh
imp at bsdimp.com
Fri Aug 3 04:14:22 UTC 2007
In message: <1186101359.846.12.camel at RabbitsDen>
"Alexandre \"Sunny\" Kovalenko" <alex.kovalenko at verizon.net> writes:
: On Thu, 2007-08-02 at 10:08 -0700, Nate Lawson wrote:
: > M. Warner Losh wrote:
: > > In message: <46AE8F78.1060203 at root.org>
: > > Nate Lawson <nate at root.org> writes:
: > > : Hajimu UMEMOTO wrote:
: > > : >>>>>> On Mon, 30 Jul 2007 23:31:33 +0200
: > > : >>>>>> Pietro Cerutti <gahr at gahr.ch> said:
: > > : > gahr> My patch is really just a first draft that I wrote in order to have
: > > : > gahr> feedbacks on the general idea to implement a temperature controlling
: > > : > gahr> system inside powerd, and doesn't implement hysteresis as you noted, and
: > > : > gahr> your feedback is that it's not a good idea, which I respect.
: > > : >
: > > : > It is rather backward, IMHO. I did implement a passive cooling
: > > : > feature as an enhancement of powerd(8) like you did, during initial
: > > : > phases. Then, I implemented it in our kernel as a result.
: > > :
: > > : I'll take a look at your patch. Umemoto-san is right in that you really
: > > : want the kernel to control cooling. What happens if powerd dies/hangs
: > > : and your system burns up? Passive cooling is often a last resort to
: > > : keep the system from overheating.
: > >
: > > I keep getting the system shutting down on my HP by FreeBSD because
: > > the temperature exceeds the _CRT value. Maybe there's something wrong
: > > with my values, since it happens a lot:
: > >
: > > hw.acpi.thermal.min_runtime: 0
: > > hw.acpi.thermal.polling_rate: 10
: > > hw.acpi.thermal.user_override: 0
: > > hw.acpi.thermal.tz0.temperature: 0.0C
: > > hw.acpi.thermal.tz0.active: -1
: > > hw.acpi.thermal.tz0.passive_cooling: 1
: > > hw.acpi.thermal.tz0.thermal_flags: 0
: > > hw.acpi.thermal.tz0._PSV: 90.0C
: > > hw.acpi.thermal.tz0._HOT: -1
: > > hw.acpi.thermal.tz0._CRT: 94.0C
: > > hw.acpi.thermal.tz0._ACx: 40.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
: > >
: > > Note: temperature is always 0.0C.
: > >
: > > What can I do to help my situation, if I really want the kernel doing
: > > the cooling?
: > Your embedded controller is timing out. Thus you're getting a bogus
: > value for _TMP.
: I have sort of picked up this thread in the middle... was it determined
: that EC is timing out? The reason for asking is -- I used to have a
: laptop where _TMP would just read value from the memory location, which
: was never populated anywhere else in ASL. Call to _PSV method would go
: figure current temperature and start fan, if necessary. Ugly...
: Dumping ASL (using instructions from handbook) and looking for something
: Method (_TMP, 0, NotSerialized)
: might be a real eye opener.
: If you would like me to take a look at your ASL, send it to me privately
: -- I've only done it for one laptop, so no claims of the great skill
: there, but maybe it is as simple as the other one ;)
Method (_TMP, 0, NotSerialized)
If (\_SB.PCI0.LPC0.ECOK ())
Multiply (\_SB.PCI0.LPC0.EC0.THEM, 0x0A, Local0)
Add (Local0, 0x0AAC, Local0)
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